THE HOG. 4*73 



To estimate with any rigoi* the quantity of azotized manure which 

 ought to result from the forage consumed on the farm, it were ne- 

 cessary to know the proportion of azote contained in the bodies of 

 all the animals entertained upon it. Having the increase of weight 

 that occurred in the stable, cow-house, pig-stye, and poultry-yard, we 

 should then be in a condition to Know the precise quantity of dung 

 wiiich it would be necessary to retrench from that which the forage 

 ought to have produced, had there been no production of animal 

 matter, had the whole of the azote of the food passed through the 

 live-stock to the dung-hill. Unfortunately, we have no very precise 

 data by which we might calculate the quantity of azote contained in 

 a living animal. I shall, nevertheless, endeavor to apply such as 

 we possess. 



From a few practical experiments, and the information at my 

 command, I admit that the following substances in their usual state 

 contain per cent. : 



Moisture. Dry matter. Salts. Azote. 



Beef-flesh 77 28 1.0 8.5 



Veal " 



Blood 80 20 0.9 8.0 



Skin 60 40 1.0 7.2 



Hair 9 81 2.0 13.8 



Horn 9 91 0.7 14.4 



Beef bones (tibia) 80 70 " 



An entire skeleton 86 64 85.0 5.2 



Brain, intestines, &c 81 10 1.0 2.9 



Fat freed from skin 20 80 " 1-9 



These data applied to the various parts which enter into the 

 constitution of the animals which up to this point have engaged 

 our attention, we should have for the quantity of azote per cent. 



contained : 



In homed cattle 8.47 



In the horse 8.64 



Inthehog 8.80 



In the sheep 8.66 



Average 8.64 



For every 100 lbs. of live weight produced on the farm, conse- 

 quently, we may, without probably being a great way from the truth, 

 presume that there has been 3.6 of azote fixed, azote obtained from 

 the forage, and which, consequently, cannot go to the dung heap ; in 

 other words, every 100 lbs. of live weight produced, deprive the 

 establishment of 180 lbs. of dry standard dung, or nearly 18 cwts. 

 of moist farm-yard dung.* 



We may be allowed, therefore, to entertain the hope that we shall 

 one day be able, from the quantity of forage consumed upon a farm, 

 to calculate the actual quantity of manure which we shall have at 

 our disposal. To arrive at this result, it would indeed only be ne- 

 cessary to subtract the manure represented by the azote exhaled 

 from and fixed in the bodies of the stock, from the amount of azo- 



• The discussion will undoubtedly extend by and by to phosphoric acid. I shall 

 only say at this time, that from the results obtained in the case of a pig, tlie phos- 

 phoric add appears to bo in tho proportion of from 2 to 3 per cent, of the live weight 



40* 



